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The four embassy bombers sentenced to life behind bars will be shipped to a hellish maximum-security prison that is “brutal beyond compare.”

Their new home is the infamous federal Penitentiary ADX in Florence, Colo., known as Supermax, or simply, “the dungeon.”

The drab and depressing concrete-and-steel facility houses 387 of America’s most despicable criminals, most in strict solitary confinement.

“The isolation is brutal beyond compare. So are the inmates. This is it. The end of the line,” said Terence Gorski, a behavioral therapist who specializes in criminal justice.

“This is where the federal government puts its ‘worst of the worst’ prisoners . . . Here, rehabilitation is hardly an issue.

“It is the only prison specifically designed to keep every occupant in near-total solitary confinement . . . The worst-behaved men could serve an entire sentence – decades – in isolation.”

Among the 387 residents of the prison is Unabomber Ted Kaczynski, serving four life sentences plus 30 years. Oklahoma City bomber Timothy McVeigh lived there until his execution by lethal injection.

Most residents of Supermax live in cells measuring 7 by 12 feet.

Their furnishings – a bed, desk and stool – are made of gray, poured concrete and built into the drab, white walls. The metal sink and toilet are operated by small buttons that can’t be removed.

Each cell has a 3-inch-wide, 3-foot-high window that looks out on a tiny concrete recreation yard and lets in very little light. The cells are sealed off by two steel doors – one made of bars and the other solid steel.

The layout stops any talk between prisoners, and contact with prison officials is also limited.

“The ADX goes to great lengths to bring everything into the cells – books, food, television – so that inmates never need to leave,” Gorski said.

Hundreds of surveillance cameras ensure no prisoner has a moment of privacy, and routine strip searches are the norm. Most prisoners spend no more than a few hours a week outside there cells.

Other inmates include: McVeigh’s accomplice, Terry Nichols; actor Woody Harrelson’s dad, Charles, who’s in for murdering a federal judge; and Luis Felipe, leader of New York’s Latin Kings street gang, who ordered the deaths of six gang members from his cell in another prison.

ADX, which cost $150 million to build, was opened in November 1994 to deal with problem prisoners posing a high-security risk, the Federal of Bureau of Prisons said.

Each prisoner costs taxpayers more than $100 a day to house – but officials say the cost is small for the types of monsters that are kept off the streets.

Some critics complain that visits and phone calls from family and friends are so severely restricted, prisoners can eventually lose their minds.

While that issue has been debated since the place opened, nobody has ever argued that the facility isn’t very secure.